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in subjects: "oil wells"  
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Electrically-Controlled Puller For Oil-Well Casings.

Description: Patent for an improved oil well casing puller that has electromagnets that will lock against the inside of the casing and be pulled out of the well. The pulley within the casing can be used accordingly and can also be locked with the casing or released from it.
Date: April 12, 1921
Creator: Dooley, William D.
Partner: UNT Libraries Government Documents Department

Sample-Taking Device.

Description: Patent for a sample-taking device to be used in well-drilling processes, which is unique in its simple construction, low manufacturing costs, and ease of use.
Date: May 24, 1921
Creator: Christian, Walton G.
Partner: UNT Libraries Government Documents Department

Polished-Rod Clamp.

Description: Patent for improvements in Polished-Rod Clamps that "quickly and easily attached to a rod without the use of tools" (lines 56-57) and "be easily operated at a distance from a pump" (lines 59-60).
Date: November 8, 1921
Creator: Weister, Edward P.
Partner: UNT Libraries Government Documents Department
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